桥梁建设
橋樑建設
교량건설
BRIDGE CONSTRUCTION
2015年
2期
77-82
,共6页
大跨度桥梁%涡激共振%颤振%倒角%风嘴%导流板%抗风设计%气动措施
大跨度橋樑%渦激共振%顫振%倒角%風嘴%導流闆%抗風設計%氣動措施
대과도교량%와격공진%전진%도각%풍취%도류판%항풍설계%기동조시
long span bridge%vortex-induced resonance%flutter%rounded corner%wind fair-ing%guide vane%wind-resistant design%aerodynamic measure
为提高大跨度桥梁的抗风性能，对该类桥梁抑制涡激共振和提高颤振稳定性的常用气动措施及其机理进行初步分析。桥梁涡激共振和颤振稳定性与旋涡的产生和漂移有关，因此气动优化的一般原则是改善结构迎风面和背风面的气动外形以延缓或避免流动分离、减小分离涡尺度、阻碍旋涡漂移路径。抑制桥梁涡激振动一般采用设置倒角、安装风嘴和优化风嘴形状、安装导流板等气动措施；提高桥梁颤振稳定性一般采用安装风嘴和优化风嘴形状、安装稳定板和气动翼板等气动措施。研究表明采用气动措施后，大跨度桥梁的气动性能得到改善。
為提高大跨度橋樑的抗風性能，對該類橋樑抑製渦激共振和提高顫振穩定性的常用氣動措施及其機理進行初步分析。橋樑渦激共振和顫振穩定性與鏇渦的產生和漂移有關，因此氣動優化的一般原則是改善結構迎風麵和揹風麵的氣動外形以延緩或避免流動分離、減小分離渦呎度、阻礙鏇渦漂移路徑。抑製橋樑渦激振動一般採用設置倒角、安裝風嘴和優化風嘴形狀、安裝導流闆等氣動措施；提高橋樑顫振穩定性一般採用安裝風嘴和優化風嘴形狀、安裝穩定闆和氣動翼闆等氣動措施。研究錶明採用氣動措施後，大跨度橋樑的氣動性能得到改善。
위제고대과도교량적항풍성능，대해류교량억제와격공진화제고전진은정성적상용기동조시급기궤리진행초보분석。교량와격공진화전진은정성여선와적산생화표이유관，인차기동우화적일반원칙시개선결구영풍면화배풍면적기동외형이연완혹피면류동분리、감소분리와척도、조애선와표이로경。억제교량와격진동일반채용설치도각、안장풍취화우화풍취형상、안장도류판등기동조시；제고교량전진은정성일반채용안장풍취화우화풍취형상、안장은정판화기동익판등기동조시。연구표명채용기동조시후，대과도교량적기동성능득도개선。
To improve the wind resistant performance of long span bridges ,the common aero‐dynamic measures and their mechanism for suppressing the vortex‐induced resonance and for im‐proving the flutter stability of the bridges are preliminarily analyzed .Since the vortex‐induced res‐onance and flutter stability of the bridges are correlated with the vortex generation and vortex drift ,the general principle of optimizing the aerodynamic measures is to improve the windward and leeward structural aerodynamic profiles in order to delay or avoid the flow separation ,reduce the separated vortex scales and impede the vortex drift paths .As regards the aerodynamic measures for suppressing the vortex‐induced vibration of the bridges ,the rounded corners and wind fairings are generally installed ,the shapes of the wind fairings are optimized and the guide vanes are in‐stalled while as regards the measures for improving the flutter stability ,the wind fairings are gen‐erally installed ,the shapes of the wind fairings are optimized and the stabilizers and aerodynamic wing plates are installed .Researches indicate that the aerodynamic performance of the long span bridges can be improved after these measures have been taken .
